or PHILADELPHIA. 227 



each side : elytia with an elevated, submarginal line each side, 

 originating on the humerus, and nearly parallel with the ex- 

 terior edge. 



The posterior thighs are much less dilated than those of col- 

 laris Fabr. 



6. A. 5-viTTATA. — Yellowish; thorax four or five-spotted : ely- 

 tra five-lined. 



Inhabits Missouri. 



Body oblong-oval, yellowish, glabrous : antennae black ; three 

 basal joints rufous beneath : thorax with an abbreviated, black 

 line on the middle of the posterior submargin, and a semi-circu- 

 lar series of four equal, equidistant, suborbicular black spots : 

 posterior edge concave at the scutel : scutel black : elytra with a 

 common sutural fillet; each elytron with a fillet originating at 

 the humerus and terminating near the tip, and another marginal, 

 less [86] dilated fiilet, confluent with the sutural vitta at tip; 

 region of the origin of the posterior feet black : thighs rufous : 

 tarsi, and a line on the superior edge of the two anterior pairs of 

 thighs, together with a line on the inferior edge of the tibia, black. 



Length more than three-tenths of an inch. 



The arrangement of the lines of the elytra are similar to those of 

 A. caroliniana Fabr. The head is sometimes black at base, and 

 the two intermediate thoracic dots are confluent. 



Found in considerable numbers on the common elder (Sam- 

 bucus) and some other plants. On the evening of the 16th of 

 June, I observed great numbers of these flying in a south-east 

 direction from near St. Louis, obliquely across the Mississippi 

 towards an island, the wind at the same time blowing moderately 

 from the eastward ; the subsequent evening, about the same 

 hour, they returned by the same route reversed, the wind di- 

 rectly opposing them; both of these days were very warm. 

 During our progress up the Missouri river, I observed, several 

 times, similar migrations of this species. 



7. A. NANA. — Cupreous or brassy, polished; beneath black- 

 ish ; antennae and feet rufous ; elytra striate. 



Inhabits the United States. 



Body green, cupreous or golden, polished, punctured : head 

 impunctured : antennae rufous ; second joint nearly as long as 

 1824.] 



